Sony IT-M202 - Manual (Page 11)

Choose the dialing mode
For the telephone to work properly, select an appropriate dialing mode
(tone or pulse).
Depending on your dialing system, set the DIAL MODE switch as
follows:
c
a
H
H
5
IS
V
H
fl)
3
A
O
If your dialing system is Set the switch to
Tone T
Pulse P
If you aren't sure of your dialing system
Make a trial call with the DIAL MODE switch set to T.
If the call connects, leave the switch as is; otherwise, set to P.
Getting Started 11